docs: def get_sites(self, domain=None, show=True, proxy=None, timeout=0):
          """
          GET Wikimedia sites via Extension:SiteMatrix
          https://www.mediawiki.org/wiki/Extension:SiteMatrix
  
          Optional params:
          - [domain]: filter sites on this domain, e.g. 'wiktionary.org'
  
          Optional arguments:
          - [show]: <bool> echo page data if true
          - [proxy]: <str> use this HTTP proxy
          - [timeout]: <int> timeout in seconds (0=wait forever)
  
          Data captured:
          - random: randomly selected wiki site
          - sites: <list> of wiki sites (hundreds) from commons SiteMatrix
          """
          if domain:
              self.params.update({'domain': domain})
  
          self.params.update({'wiki': self.COMMONS})
  
          self._get('sitematrix', show, proxy, timeout)
  
          del self.params['wiki']
  
          return self